The MFJ-4601 weatherproof window feed-through panel brings six coax-fed HF/VHF/UHF antennas and ground into your house without drilling through walls. Simply place in window sill and close window. One cut customizes it for any window up to 48 inches. Use horizontally or vertically. Pressure-treated red western cedar wood with 5/8 inch thick insulating properties is painted with a heavy coat of white outdoor enamel paint. Edges sealed by provided weather-stripping.